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Cant override TargetTexture-Settings / build size increased a lot! Why are they needed?

Dear support-team,

I just updated Unity to 2019.4.0 and Vuforia to 9.2.7 because of extreme startup times for 64bit android builds in 2018.4.23.

(https://developer.vuforia.com/forum/unity/android-build-starts-delay-25-secondes-due-large-database#comment-71512)

It solved this problem but now I am facing huge build sizes. It used to be 53 mb now it's 200mb!

The reason is that I used to compress the image target textures in the editor-folder (override to etc2 4 bits).

But now all changes that I apply to the override settings switch back to default after I have applied them.

Is Vuforia preventing this? And why  do I need the textures in the build. I understand that they are necessary to set things up in the editor but why are they included in the build?

Help is much appreciated and best, Friedulia